title: 75 W 40% efficiency single-mode all-fiber erbium-doped laser cladding pumped at 976 nm.
abstract: Optimization of Yb-free Er-doped fiber for lasers and amplifiers cladding pumped at 976 nm was performed in this Letter. The single-mode fiber design includes an increased core diameter of 34 μm and properly chosen erbium and co-dopant concentrations. We demonstrate an all-fiber high power laser and power amplifier based on this fiber with the record slope efficiency of 40%. To the best of our knowledge, the achieved output power of 75 W is the highest power reported for such lasers.
authors.affiliation: Fiber Optics Research Center of the Russian Academy of Sciences, 38 Vavilov Street, Moscow 119333, Russia. alterlk@yandex.ru
authors.forename: L V
authors.initials: LV
authors.lastname: Kotov
authors.forename: M E
authors.initials: ME
authors.lastname: Likhachev
authors.forename: M M
authors.initials: MM
authors.lastname: Bubnov
authors.forename: O I
authors.initials: OI
authors.lastname: Medvedkov
authors.forename: M V
authors.initials: MV
authors.lastname: Yashkov
authors.forename: A N
authors.initials: AN
authors.lastname: Guryanov
authors.forename: J
authors.initials: J
authors.lastname: Lhermite
authors.forename: S
authors.initials: S
authors.lastname: Février
authors.forename: E
authors.initials: E
authors.lastname: Cormier
mesh_terms: D004871:Erbium; D007834:Lasers; D055100:Optical Fibers
chemical_list: D004871:Erbium